// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_COCOA_SYSTEM_HOTKEY_HELPER_MAC_H_
#define CONTENT_BROWSER_COCOA_SYSTEM_HOTKEY_HELPER_MAC_H_

#include <memory>

#include "base/macros.h"
#include "base/memory/singleton.h"
#include "base/memory/weak_ptr.h"

#ifdef __OBJC__
@class NSDictionary;
#else
class NSDictionary;
#endif

namespace content {

class SystemHotkeyMap;

// This singleton holds a global mapping of hotkeys reserved by OSX.
class SystemHotkeyHelperMac {
public:
    // Return pointer to the singleton instance for the current process.
    static SystemHotkeyHelperMac* GetInstance();

    // Loads the system hot keys after a brief delay, to reduce file system access
    // immediately after launch.
    void DeferredLoadSystemHotkeys();

    // Guaranteed to not be NULL.
    SystemHotkeyMap* map() { return map_.get(); }

private:
    friend struct base::DefaultSingletonTraits<SystemHotkeyHelperMac>;

    SystemHotkeyHelperMac();
    ~SystemHotkeyHelperMac();

    // Must be called from the FILE thread. Loads the file containing the system
    // hotkeys into a NSDictionary* object, and passes the result to FileDidLoad
    // on the UI thread.
    void LoadSystemHotkeys();

    // Must be called from the UI thread.  This takes ownership of |dictionary|.
    // Parses the system hotkeys from the plist stored in |dictionary|.
    void FileDidLoad(NSDictionary* dictionary);

    std::unique_ptr<SystemHotkeyMap> map_;

    DISALLOW_COPY_AND_ASSIGN(SystemHotkeyHelperMac);
};

} // namespace content

#endif // CONTENT_BROWSER_COCOA_SYSTEM_HOTKEY_HELPER_MAC_H_
